Marinate the chicken with lime juice, and season with chile powder, salt, pepper, garlic powder and cumin

Season vegetables with salt and pepper and toss with olive oil. To grill the onions and peppers outside on the grill, use a cast iron skillet and grill covered over medium heat until tender, about 15 minutes. Or, to cook them indoors, you can use a large skillet on the stove over medium heat for 16 to 18 minutes, covered until the onions and peppers are soft.

Heat an outdoor grill or indoor grill pan over medium heat; grill chicken until cooked through, about 8 minutes on each side. Transfer to a cutting board when done and cut into strips. Once cooked, combine with the peppers and onions. Serve immediately with warmed tortillas, cheese and toppings.